<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
    <title>Bootstrap 101 Template</title>
    <!-- Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <style>
    .demo {
        border: 1px red solid;
        border-radius: 3px;
        margin: 10px 0;
    }
    </style>
</head>

<body>
    <div class="container">
        <h1>你好，世界！</h1>
        <div class="row">
            <div class="col-md-8 demo">.col-md-8</div>
            <div class="col-md-4 demo ">.col-md-4</div>
        </div>
        <div class="row">
            <div class="col-md-3 demo">3</div>
            <div class="col-md-6 demo ">6</div>
            <div class="col-md-3 demo ">3</div>
        </div>
        <div class="row">
            <div class="col-md-6 demo">.col-md-6</div>
            <div class="col-md-6 demo ">.col-md-6</div>
            <div class="col-md-12 demo ">.col-md-6</div>
        </div>
        <div class="row">
            <div class="col-md-6 demo">
                <div class="row">
                    <div class="col-md-3 demo"><img src="https://img.alicdn.com/i2/2/TB1lL6xPVXXXXcTXpXXSutbFXXX.jpg_100x150q100.jpg" alt=""></div>
                    <div class="col-md-3 demo"><img src="https://img.alicdn.com/i2/2/TB1lL6xPVXXXXcTXpXXSutbFXXX.jpg_100x150q100.jpg" alt=""></div>
                    <div class="col-md-3 demo"><img src="https://img.alicdn.com/i2/2/TB1lL6xPVXXXXcTXpXXSutbFXXX.jpg_100x150q100.jpg" alt=""></div>
                    <div class="col-md-3 demo"><img src="https://img.alicdn.com/i2/2/TB1lL6xPVXXXXcTXpXXSutbFXXX.jpg_100x150q100.jpg" alt=""></div>
                </div>
            </div>
            <div class="col-md-6 demo ">.col-md-4</div>
        </div>
        <div class="row">
            <div class="col-md-6 col-md-offset-3">
                <form class="form-horizontal">
                    <div class="form-group">
                        <label for="inputEmail3" class="col-sm-2 control-label">Email</label>
                        <div class="col-sm-10">
                            <input type="email" class="form-control" id="inputEmail3" placeholder="Email">
                        </div>
                    </div>
                    <div class="form-group">
                        <label for="inputPassword3" class="col-sm-2 control-label">Password</label>
                        <div class="col-sm-10">
                            <input type="password" class="form-control" id="inputPassword3" placeholder="Password">
                        </div>
                    </div>
                    <div class="form-group">
                        <div class="col-sm-offset-2 col-sm-10">
                            <div class="checkbox">
                                <label>
                                    <input type="checkbox"> Remember me
                                </label>
                            </div>
                        </div>
                    </div>
                    <div class="form-group">
                        <div class="col-sm-offset-2 col-sm-10">
                            <button type="submit" class="btn btn-default">Sign in</button>
                        </div>
                    </div>
                </form>
            </div>
        </div>
    </div>
    <!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery，所以必须放在前边) -->
    <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
    <!-- 加载 Bootstrap 的所有 JavaScript 插件。你也可以根据需要只加载单个插件。 -->
    <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</body>

</html>